Harry Potter lives and studies in a world anything can happen, attracts millions people.
A. where, which
B. to which, that
C. that, which
D. on which, that
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(答案→)A. where, which
B. to which, that
C. that, which
D. on which, that
解析：考查定语从句的关系词。第一空考查了关系副词，当定语从句的句子结构很完整的时候，使用关系副词。如果句子中缺少主语，宾语，表语或者定语的时候，使用关系代词。本句第一空后的anything can happen句子结构很完整，故使用关系副词where=in which。第二空的which指代前面一句话的内容，引导非限制性定语从句，在后面的句子中做主语或者宾语。在本句中which指代前面的a world在句中做主语。